【摘要】 通过对1980年冬季兰州市区风场观测资料及有关历史资料的分析发现:市区冬季以热力性的山谷风环流为主;垂直流场里东—西—东型分布,低层气流上升,高层气流下沉,有明显的城市热岛效应。更多还原

【Abstract】 Through the analysis to the observational wind field data over the urban area of lanzhou in winter 1980 and also some relevant historical records it is found that in the urban area in winter the thermal valley wind circulation plays the leading role, the vertical flow field shows a east-west-east pattern distribution, the lower layer air stream ascends and the upper layer one sinks, and there is an evident effect of heat island due to the existence of a populated city.更多还原